You mean a tandem axle cab and chassis? 10 tires? That's really a 6 wheel, but unless it's 6x6, it matters little.
OK, cab over? Conventional?
C series with 534 would have to be C900 I think. They went up the scale, according to a post here that I am too lazy to look for. 700s got the 401, 800s the 477, 900 the 534---MAYBE. I could be full of beans. But there should be an
emblem on the cab, or, the first
part of the VIN will tell the tale.
Conventional would be F series, or possibly designated "T" series, for "tandem axle". Again, a 900 methinks.
Tall cabover? Maybe an N series.
Check out these threads...these things are obsolete and not impossible to find
parts for, but might be an challenge.
If you are going to put it to work, I'd think twice, three times, how ever many times I had to think about a newer
diesel powered truck.
jmo, for the most part.